mm5-aermod tool

MM5-AERMOD Tool

Roger W. BrodeU.S. EPA/OAQPS

Air Quality Modeling Group

9th Conference on Air Quality ModelingOctober 9, 2008

Research Triangle Park, NC

Outline

• Problem Statement and Objective• MM5-AERMOD Tool Description• Example Test Case – Detroit• Next Steps• Summary

AERMOD Met Data Issues:Problem Statement

• Meteorological data are key inputs to air quality models such as AERMOD

• NWS met data currently used in most cases; however– Met observation sites may not be representative of source locations

(10’s-100’s km away)– Representativeness issue has new dimensions given AERMOD’s

dependence on surface characteristics: roughness, Bowen ratio, albedo

– Upper air data sparsely located, especially in mountainous areas• Significant gaps in NWS data for calms and variable winds;

frequency of gaps has increased with ASOS and METAR• Onsite meteorological data collection is expensive and time

consuming

Potential Solution

• These problems may be alleviated by using outputs from prognostic gridded meteorological models

• Gridded meteorological models routinely generate datasets that could be beneficial for use in dispersion models like AERMOD– Gridded met data already used for regulatory

modeling with CALMET/CALPUFF for long range transport applications

OBJECTIVE:Develop MM5-AERMOD Tool that . . .

• Provides spatially consistent AERMOD inputs– Grid cell selected based on application/source site; overcomes

sparsity of observed data– Surface and upper-air data located in same grid cell– Hourly values available for every grid cell

• Allows AERMOD to use parameters calculated by MM5’s advanced atmospheric physics (e.g., heat flux, friction velocity, PBL height)

• Uses MM5 data to calculate other parameters previously calculated from NWS observations (e.g., convective velocity scale)

Surface Roughness Bowen Ratio

Albedo

User Input

NWS Obs

AERMET

To AERMOD

.sfc file .pfl file

Gridded outputMM5

MM5 – AERMOD Tool

To AERMOD

.sfc file .pfl file

Traditional AERMET Application MM5-AERMOD Tool Application

Example Test Case – Detroit Area

• Apply MM5-AERMOD Tool– Extract 2002 MM5 12km data for Detroit

Metropolitan Airport (DTW) grid cell– Sub-domain of 30 x 30 grid cells around Detroit was

extracted from MM5 data for input to tool• Apply traditional NWS-AERMET approach

– Use 2002 DTW Integrated Surface Data (TD-3505) and DTX upper air data

• Analyze, compare, document results

MM5 12km Grid Cell for DTW

Detroit 2002 Windroses

NWS (DTW) MM5 (12km Grid Cell)

At anemometer height of 10m At first half-sigma level of 19m

Detroit 2002 MM5-NWS AERMOD Comparisons – Source Descriptions

* Source ID is a combination of the source release height (00, 10, 35, 50, or 100), buoyant (BY) ornon-buoyant (NB) release, and downwash (DW) or no downwash (ND)

** Hb = building height

Source ID *

Height (m)

Exit Temp. (K)

Exit Velocity (m/s)

Diameter (m) Downwash

00NBND 0.0 ambient 0.0 0.0 None – no building 10BYND 10.0 300 15.0 0.5 None – no building

10BYDW 10.0 293 1.0 2.4 Squat; source on NE corner

35BYDW 35.0 432 11.7 2.4 Squat; source on NE corner

35BYDW2 35.0 432 11.7 2.4 Squat; source 4 Hb off NE corner **

Detroit 2002 MM5-NWS AERMOD Comparisons – Model Results (C/Q)

24-hr Averages – Rural

1.750.130.071.590.130.08100BYND1.717.904.631.5810.106.3950NBND1.251.701.361.252.021.6235BYDW21.1425.4122.371.1225.9323.1635BYDW0.841.702.030.932.022.1735BYND1.75250.58143.311.91305.53159.8210BYDW1.21103.9186.201.33135.13101.3010BYND1.80312.10173.231.87368.20196.8310NBND7.2427708.703825.2613.2969048.505194.1800NBND

RatioMM5AERMETRatioMM5AERMETSource IDMM5/NWSH2H (μg m-3/g s-1)MM5/NWSH1H (μg m-3/g s-1)

Meteorology Comparison for MM5 H1H 24-hr Average Day – Rural

------- MM5 DATA --------YR MN DY HR HFLUX USTAR WSPD WDIR2 12 11 1 -3.5 0.030 1.62 226. 2 12 11 2 -2.1 0.021 1.38 223. 2 12 11 3 -0.9 0.011 1.09 221. 2 12 11 4 -0.6 0.009 0.77 220. 2 12 11 5 -0.6 0.009 0.49 217. 2 12 11 6 -0.6 0.009 0.20 216. 2 12 11 7 -0.6 0.009 0.12 27. 2 12 11 8 -0.7 0.010 0.42 33. 2 12 11 9 -0.7 0.011 0.64 39. 2 12 11 10 -0.8 0.013 0.73 45. 2 12 11 11 -0.9 0.020 0.70 52. 2 12 11 12 -0.4 0.122 0.54 65. 2 12 11 13 9.7 0.197 0.44 83. 2 12 11 14 8.4 0.185 0.38 116. 2 12 11 15 2.2 0.130 0.39 160. 2 12 11 16 -0.6 0.038 0.58 187. 2 12 11 17 -0.9 0.022 0.76 201. 2 12 11 18 -0.8 0.014 0.93 215. 2 12 11 19 -1.1 0.015 1.14 226. 2 12 11 20 -2.3 0.023 1.42 235. 2 12 11 21 -4.3 0.033 1.74 237. 2 12 11 22 -7.3 0.047 2.08 238. 2 12 11 23 -11.0 0.063 2.44 239. 2 12 11 24 -14.6 0.080 2.77 240.

------- MM5 DATA -------- ------- NWS DATA --------YR MN DY HR HFLUX USTAR WSPD WDIR HFLUX USTAR WSPD WDIR2 12 11 1 -3.5 0.030 1.62 226. -19.5 0.244 2.60 181.2 12 11 2 -2.1 0.021 1.38 223. -999.0 -9.000 0.00 0.2 12 11 3 -0.9 0.011 1.09 221. -999.0 -9.000 0.00 0.2 12 11 4 -0.6 0.009 0.77 220. -999.0 -9.000 0.00 0.2 12 11 5 -0.6 0.009 0.49 217. -999.0 -9.000 0.00 0.2 12 11 6 -0.6 0.009 0.20 216. -999.0 -9.000 0.00 0.2 12 11 7 -0.6 0.009 0.12 27. -999.0 -9.000 0.00 0.2 12 11 8 -0.7 0.010 0.42 33. -999.0 -9.000 0.00 0.2 12 11 9 -0.7 0.011 0.64 39. -999.0 -9.000 0.00 0.2 12 11 10 -0.8 0.013 0.73 45. 7.9 0.189 1.50 341.2 12 11 11 -0.9 0.020 0.70 52. 8.0 0.252 2.10 360.2 12 11 12 -0.4 0.122 0.54 65. 13.7 0.196 1.50 350.2 12 11 13 9.7 0.197 0.44 83. 56.6 -9.000 0.00 0.2 12 11 14 8.4 0.185 0.38 116. 35.1 -9.000 0.00 0.2 12 11 15 2.2 0.130 0.39 160. 23.7 -9.000 0.00 0.2 12 11 16 -0.6 0.038 0.58 187. 6.4 -9.000 0.00 0.2 12 11 17 -0.9 0.022 0.76 201. -999.0 -9.000 0.00 0.2 12 11 18 -0.8 0.014 0.93 215. -999.0 -9.000 0.00 0.2 12 11 19 -1.1 0.015 1.14 226. -999.0 -9.000 0.00 0.2 12 11 20 -2.3 0.023 1.42 235. -999.0 -9.000 0.00 0.2 12 11 21 -4.3 0.033 1.74 237. -4.8 0.086 1.50 255.2 12 11 22 -7.3 0.047 2.08 238. -999.0 -9.000 0.00 0.2 12 11 23 -11.0 0.063 2.44 239. -999.0 -9.000 0.00 0.2 12 11 24 -14.6 0.080 2.77 240. -11.1 0.192 2.10 244.

MM5-NWS AERMOD Model Results (C/Q)Using MM5 z0 ~ 0.3m for AERMET/NWS

MM5-NWS AERMOD Model Results (C/Q)Using AERSURFACE z0 ~ 0.06m for AERMET/NWS

2.190.130.062.010.130.06100BYND

1.707.904.651.4810.106.8550NBND

1.071.701.591.032.021.9735BYDW2

1.2125.4121.031.1725.9322.1235BYDW

1.911.700.892.012.021.0135BYND

1.59250.58157.351.68305.53182.3610BYDW

1.85103.9156.211.94135.1369.6110BYND

2.12312.10147.022.40368.20153.6210NBND

2.7327708.7010151.596.5069048.5010621.3800NBND

MM5-NWS AERMOD Model Results (C/Q)Using AERSURFACE z0 ~ 0.06m for AERMET/NWSNWS winds supplemented with 1-minute ASOS data

Summary of MM5-AERMOD Status

• Draft MM5-AERMOD Tool has been developed• Comparisons of MM5-AERMOD vs. traditional

AERMET approach for Detroit 2002– Preliminary results encouraging, especially when

AERSURFACE and 1-minute ASOS wind data included• Basic approach is promising, but considerable work

remains before endorsing for regulatory modeling

MM5-AERMOD Next Steps• Conduct more detailed comparison of MM5-AERMOD Tool vs. NWS-

AERMET results, including meteorology and dispersion• Conduct additional “sensitivity” analyses using meteorological inputs

from each approach, including:– wider range of source types;– different options for interpolation of MM5 grid;– use of full profiles of MM5 wind and temperature vs. “degraded” subsets of MM5 data; – grid-to-grid variability across a domain; and– sensitivity to MM5 grid resolution

• Extend comparisons to other geographic areas; tentative plans include Atlanta, GA, Birmingham, AL, and Baltimore, MD

• Coordinated collaboration with other researchers (e.g., UNC MCIP2AERMOD project with FAA)

• Assess use of multiple MM5 grids within single AERMOD application• Assess interim approach of deriving pseudo-UA data from MM5 for

processing through AERMET with site-specific or NWS surface data• “Validate” use of MM5-AERMOD data against field study data

MM5-AERMOD Next Steps (cont.)

• Consider coupling MM5-AERMOD Tool with MM5-CALPUFF Tool

• Extension of effort to support WRF model, possibly based on an MCIP-to-AERMOD approach (MCIP being the meteorological processor for CMAQ)

• Host invited workshop on use of gridded prognostic met data with dispersion models to guide the best use of science

• As the range of options for developing met inputs for models expands, need to develop criteria for acceptance

• Questions of how to disseminate this “technology” to user community will eventually need to be addressed

Questions?

mm5-aermod tool - us epa · • apply mm5-aermod tool – extract 2002 mm5 12km data for detroit...

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